It was my (ridiculous) mistake…
Turned on WP_DEBUG_LOG and noticed a different warning about headers already sent in my functions.php line 1.
Don’t know how, but the first line on the file was blank (Before the php tag) and that affected MPDF, but apparently everything else was working fine. I just erased that line and the plugin got back to work as smooth as before.
// This line was blank
<?php
// My code
?>
Thank you again, for your suggestion about WP_DEBUG-LOG and for this really wonderful plugin.
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This reply was modified 4 years, 10 months ago by arthpix. Reason: Adding information
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This reply was modified 4 years, 10 months ago by arthpix.
Thankyou, David.
Yes I enabled WP_DEBUG and the output was the one i posted in my first message. There aren’t other error notices in the site.
